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I assume the process was the MsMpEng.exe - that is MSE alright. I would understand the 50% whilst it was scanning - and it can do that for a looong time if you specified "full scan". But normally MSE should be quasi invisible. mine is at 0% most of the time.

Have a look at the settings whether you can see anything unusual. And do not turn it off, then you have no protection.

I suggest you download it again and save it. Then you disconnect from the net, uninstall the current one and reinstall the new downloaded version. Here are 32bit and 64bit cleaners you should use for the uninstall: Tool(32bits) - Tool(64bits)

I can't put Real-Time priority to a proccessHello there,
I'm using Matlab daily and I am using it in Real Time and I have some isues, so my friend told me how to put it on Real Time priorty in Task Manager...
I tried but I god error message:
Unable to set Realtime priority. The priority was set to High instead...
Any ideas how...